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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* fs_struct.cc — Per-task filesystem context (cwd, root)
*/
#include <lume/fs_struct.h>
#include <lume/slab.h>
/* ================================================================== */
/* alloc_fs_struct */
/* ================================================================== */
fs_struct* alloc_fs_struct()
{
auto* fs = new fs_struct{};
if (!fs) return nullptr;
fs->count.store(1);
fs->umask = 022;
fs->root = {nullptr, nullptr};
fs->pwd = {nullptr, nullptr};
return fs;
}
/* ================================================================== */
/* put_fs_struct */
/* ================================================================== */
void put_fs_struct(fs_struct* fs)
{
if (!fs) return;
int old = fs->count.fetch_sub(1);
if (old > 1) return;
path_put(&fs->root);
path_put(&fs->pwd);
delete fs;
}
/* ================================================================== */
/* copy_fs_struct — for fork without CLONE_FS */
/* ================================================================== */
fs_struct* copy_fs_struct(const fs_struct* old_fs)
{
auto* fs = alloc_fs_struct();
if (!fs) return nullptr;
fs->umask = old_fs->umask;
fs->root = old_fs->root;
path_get(&fs->root);
fs->pwd = old_fs->pwd;
path_get(&fs->pwd);
return fs;
}
/* ================================================================== */
/* set_fs_root / set_fs_pwd */
/* ================================================================== */
void set_fs_root(fs_struct* fs, const path* p)
{
path old_root;
{
LockGuard guard(fs->lock);
old_root = fs->root;
fs->root = *p;
path_get(p);
}
path_put(&old_root);
}
void set_fs_pwd(fs_struct* fs, const path* p)
{
path old_pwd;
{
LockGuard guard(fs->lock);
old_pwd = fs->pwd;
fs->pwd = *p;
path_get(p);
}
path_put(&old_pwd);
}
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